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# Create/Upgrade a Database
If this is your first install, create a database with:
initdb /usr/local/var/postgres
To migrate existing data from a previous major version (pre-9.1) of PostgreSQL, see:
http://www.postgresql.org/docs/9.1/static/upgrading.html
# Start/Stop PostgreSQL
If this is your first install, automatically load on login with:
mkdir -p ~/Library/LaunchAgents
cp /usr/local/Cellar/postgresql/9.1.1/homebrew.mxcl.postgresql.plist ~/Library/LaunchAgents/
launchctl load -w ~/Library/LaunchAgents/homebrew.mxcl.postgresql.plist
If this is an upgrade and you already have the homebrew.mxcl.postgresql.plist loaded:
launchctl unload -w ~/Library/LaunchAgents/homebrew.mxcl.postgresql.plist
cp /usr/local/Cellar/postgresql/9.1.1/homebrew.mxcl.postgresql.plist ~/Library/LaunchAgents/
launchctl load -w ~/Library/LaunchAgents/homebrew.mxcl.postgresql.plist
Or start manually with:
pg_ctl -D /usr/local/var/postgres -l /usr/local/var/postgres/server.log start
And stop with:
pg_ctl -D /usr/local/var/postgres stop -s -m fast
# Loading Extensions
By default, Homebrew builds all available Contrib extensions. To see a list of all
available extensions, from the psql command line, run:
SELECT * FROM pg_available_extensions;
To load any of the extension names, navigate to the desired database and run:
CREATE EXTENSION [extension name];
For instance, to load the tablefunc extension in the current database, run:
CREATE EXTENSION tablefunc;
For more information on the CREATE EXTENSION command, see:
http://www.postgresql.org/docs/9.1/static/sql-createextension.html
For more information on extensions, see:
http://www.postgresql.org/docs/9.1/static/contrib.html
# Other
Some machines may require provisioning of shared memory:
http://www.postgresql.org/docs/current/static/kernel-resources.html#SYSVIPC
To install postgresql (and ossp-uuid) in 32-bit mode:
brew install postgresql --32-bit
If you want to install the postgres gem, including ARCHFLAGS is recommended:
env ARCHFLAGS="-arch x86_64" gem install pg
To install gems without sudo, see the Homebrew wiki.